06/14/2010 05:12 am ET Updated Dec 06, 2017

Marquette Park Shooting: 3 Children, One Adult Killed In 'Horrendous' Shooting (VIDEO)

Four people--including three children--were fatally shot early Wednesday and two others were critically injured when a family member from out of state showed up at the South Side home and began shooting--reportedly because "Allah" told him to kill his family.

About 4:25 a.m., police responded to a call of a person shot in the 7200 block of South Mozart. NBC Chicago reports that the call was placed by a 12-year-old boy who said his 32-year-old uncle had come from Wisconsin with his wife and began shooting. The Chicago Sun-Times reports that the boy managed to run away from the scene to a nearby gas station to place the emergency call.

When police arrived, they encountered a "horrendous" crime scene. A seven-month-old boy, a three-year-old girl, a 16-year old girl and an adult female were all dead on the scene.

A 13-year-old boy and an unidentified female, were also shot but survived the incident, NBC reports. They were taken to Christ Hospital in Oak Lawn in critical condition, and one of them is not expected to survive.

"This is a really bad crime scene, really horrendous," 8th District Police Commander John Kupczyk told reporters. "We see a lot of crime out here that is really tragic to the community and their families, but something like this is really incomprehensible"

Police located a suspect near 59th and Racine Avenue, about four miles from the shooting, just before 6 a.m. He was being questioned early Wednesday. Kupczyk said a weapon was recovered, but it was unclear whether it was the same weapon used in the shooting. He also said the victims are family members.

The unidentified suspect, who police said lived in Janesville, Wisconsin at a residential home for recent prison parolees, said "Allah" told him to kill his family, NBC Chicago reports.

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Watch Officer Kupczyk discuss the incident here:

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